/Engine/Plugins/Experimental/Animation/CurveExpression/Source/Runtime/Public/ExpressionEvaluator.h
static [FArchive](API\Runtime\Core\Serialization\FArchive) & operator<< ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [CurveExpression::Evaluator::FExpressionObject](API\Plugins\CurveExpression\FExpressionObject) & InObject )